With RCU_NOCB_CPU you need to have the following in the kernel command line: rcu_nocbs=0-11
Ryzen 5 1600 has 12 threads so change the upper limit according to your cpu thread count.
With RCU_NOCB_CPU you need to have the following in the kernel command line:
rcu_nocbs=0-11
Ryzen 5 1600 has 12 threads so change the upper limit according to your cpu thread count.